Patent US3660979A successfully refreshed from Google Patents.
US3660979A
Expired / Lapsed
US
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Method and device for damping flow pulsations in a hydraulic system
Assignee: Nissan Motor Co Ltd
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Filing: 1970-04-01
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Granted: 1972-05-09
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Expires: 1990-04-01
Abstract
Abstract A method and device for damping flow pulsations in a liquidphase flow supplied under pressure from a conventional hydraulic pump or the like, which method comprises dividing the supplied pulsating flow into two separate flow components, causing the flow components to impinge upon each other in an enclosure so as to cancel the pulsating energy in the two flow components, and withdrawing the pulsation-free pressurized flow out of the enclosure, whereby a pressurized flow cleared of pulsations can be supplied to a hydraulic system such as an automotive power steering system.
Inventors
- 👤 Satoru Kamakura
- 👤 Yukio Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:31
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/04; B; B62; B62D; B62D5/00; B62D5/06; B62D5/062; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0396; Y10T137/2931; Y10T137/3115; Y10T137/3118
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
81 words
A method of damping pulsations produced in a working fluid circulating in a power steering hydraulic system by a hydraulic pump in the hydraulic system, comprising dividing the working fluid into two opposite flow components having pulsations of The same phase, causing the two opposite flow components to interfere with and offset the momentum of each other in an enclosure for cancelling the pulsations in the two opposite flow components, and withdrawing the thus substantially pulsation-free flow out of said enclosure.
Claim 2
Independent Claim
81 words
A method of damping pulsations produced in a working fluid circulating in a power steering hydraulic system by a hydraulic pump in the hydraulic system, comprising dividing the working fluid into two opposite flow components having pulsations of The same phase, causing the two opposite flow components to interfere with and offset the momentum of each other in an enclosure for cancelling the pulsations in the two opposite flow components, and withdrawing the thus substantially pulsation-free flow out of said enclosure.
Claim 3
Dependent Claim
140 words
In a power steering hydraulic system including a power steering for steering through boosted hydraulic pressure a steering wheel of a vehicle and a hydraulic pump for boosting a working fluid circulating in the hydraulic system to actuate the power steering, a device for damping pulsations in the working fluid comprising an enclosure communicating with said pump through an inlet conduit and with the power steering through an outlet conduit, said inlet conduit being divided into two separate nozzles of the same length opening into said enclosure and directed in a face-to-face relationship with each other at a suitable spacing inbetween, whereby two opposite flow components divided from the circulating working fluid by said two separate nozzles interfere with and offset the momentum of each other so that the pulsations of the same phase in the flow components are cancelled.
Claim 4
Dependent Claim
140 words
In a power steering hydraulic system including a power steering for steering through boosted hydraulic pressure a steering wheel of a vehicle and a hydraulic pump for boosting a working fluid circulating in the hydraulic system to actuate the power steering, a device for damping pulsations in the working fluid comprising an enclosure communicating with said pump through an inlet conduit and with the power steering through an outlet conduit, said inlet conduit being divided into two separate nozzles of the same length opening into said enclosure and directed in a face-to-face relationship with each other at a suitable spacing inbetween, whereby two opposite flow components divided from the circulating working fluid by said two separate nozzles interfere with and offset the momentum of each other so that the pulsations of the same phase in the flow components are cancelled.
Claim 5
Dependent Claim
38 words
A device according to claim 2, further comprising buffer means secured to an inner wall surface of said enclosure and terminating equi-distantly between the outlets of said two separate nozzles for intercepting thereon the two opposite flow components.
Claim 6
Dependent Claim
17 words
A device according to claim 2, wherein said two opposite flow components impinge directly upon each other.
References Cited (Backward Citations)
US2795374A
Cited
US2973013A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |